Universal drafting-machine



V.ALEXA.

UNIVERSAL DRAFTING MACHINE.

APPLICATION FILED JULY27. 1916.

4 SHEETS-SHEET I.

12V VF/VT 0R BY M6260) %M M Patented Alig. 5, 1919.

M. WITNESSES ATIWR I [VEY V. ALEXA.

UNIVERSAL DRAFTING MACHINE.

APPLICATION FILED JULY 21. 1916.

1 ,3 1 1 ,867. Patented Aug. 5, 1919.

4 SHEETSSHEET 2.

[/VVE/VTOR B QZWXAL Z M fM wmvzsszs ATTORNEY V. ALEXA.

UNIVERSAL DRAFTING MACHINE.

APPLICATION FILED 1ULY27. 1916.

1,311,867. I PatentdAug. 5,1919.

4 SHEETS-SHEET 3- (16 26 27 IAVl/VI'OR r n BYWQM MFM / WITNESSES/WATTOR/VE 'l'IIB COLUMBIA PLANouRM'u $0., WASHINGTON, n. C.

V. ALEXA.

UNIVERSAL DRAFTING MACHINE.

APPLICATION FILED JULY 27, 1916.

1,311,867.- Patented Au 5, 1919.

' 4 SHEETSSHEET 4.

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VICTOR ALEXA, OF CHICAGO, ILLINOIS.

UNIVERSAL DRAFTING-MACHINE.

Specification of Letters Patent.

Patented Aug. 5, 1919.

Application filed July 27, 1916. Serial No. 111,617.

To all whom it may concern:

Be it known that I, Vroron ALEXA, a citizen of the United States ofAmerica, and a residentof Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements in UniversalDraftingMachines, of which the following is a specification.

Thisinvention relates to im rovements in drawing tables of the rotatab etype, WhlCll are provided with a relatively ad ustable straight edge andwhich combine in one device means for accomplishing the results usuallyattained by the use of a T -square, triangles, bevel rotractors,centrllineads, section liners, cy lindrical shading instruments, andrules or scales.

An object of the invention is to provide an improved drawing table whichmay be easil and instantly adjusted in helght, and to any desired angle,in order that the draftsman may work in a standing position or uprightsitting position.

Further objects of the invention are to provide an improved constructionof circular graduated disk for supporting the material for receiving thedrawing; to provide improved means for. locking the disk in any desiredangular position, to enable the drawing of all straight lines ofwhatever angle from left to right along an adjustable ruling blade; toprovide an improved construction for adjusting the ruling blade; toprovide in connection with said ruling blade an improved section liningdevice and an improved means for effecting graduated shading; to provideimprovements in the ruling blade and adjusting mechanism whereby thismechanism may be thrown into or out of operative relationship. with theruling blade and the latter adjusted by the hand, as desired; and toprovide improved means for attaching scales to the ruling device anddrawin board to enable the draftsman to quick y change from the Englishmeasure to the metric or other measure, as desired.

An illustrative embodiment of this invention is shown in theaccompanying drawings, in which: t

Figure 1 shows in side elevation a drawing table'constructed accordingto this invention. a

Fig. 2:represents a front elevation of the device.

Fig. 3 is a detail in plan of the rotatable paper supporting disk andshows the relationship between this diskand the adjustable ruling blade.

Fig. 4: is a side view of the mechanism shown in Fig. 3.

Fig. 5 shows a lower end elevation of the mechanism shown in Fig. 3. i

Fig. 6 is an enlarged fragmentary plan view of the rotatable pa ersupporting disk and shows the means or clamping paper thereon. i

Fig. 7 shows in elevation a detail of the paper clamping device.

Fig. 8 is an end view of the paper clamp- 1n device.

ig. 9 is an enlarged plan view ofthe ad'ustlng device for the rulingblade.

1g. 10 is a sectional. view taken on the line B--B of Fig. 9.

Fig. 11 is a sectional detail taken on the line A-A of Fig. 9.

Drawing tables of the general type wherepresent invention are to providean 1mproved and simplified construction with which all of the work whichcould be accomplished by the use of prior rotarydrawmg boards may beattained, and in addition further results may be attained, such asproducing sectional and raduated shadlng, quick adjustment of the rulingblade and operation of the means for stretching and clamping the drawingmaterial to the rotatable board.

Referring to the drawings, the drawing table comprises a frame 1 towhich is pivotally attached by means of arms 2 a rem tangular frame 3for supporting the rotatable board 4. The arms 2 and frame 3 may beadjusted around their pivotal supports 5 and locked in anydesiredangular position by means of a dog 6 which is suitably formed toengage any one of a series of seats or notches 7 in the frame 1. Theframe 3 may also be adjusted angularly around its pivotal connections 8with arms 2, to suit the convenience of the draftsman' while I drawing,or to permit the frame 3 to assume an inverted horizontal the table isnot in use.

a horizontal ledge 9 for supporting toolhlders10andll and an adjustablecopy support 12. r

The frame member or table 3-is provided with a centrally located bearing13 for a stub shaft 14 which is rigidly secured to the roe tata'bledrawing board 4. The rotatable boardj4 is of circular diskshape andpref:

erably marked with degree graduations 15 around its periphery, as shownin Fig. 3.

e The disk 4 has rigidly. secured thereto a rectangular drawing board 16which is cated between the four'arms 17 also secured V to the disk 4.The members 17 may'support- 3, and a space is-provided between thememremovable scales 18 and 19 as shown in Fig.

' bers 17 and drawing board- 16 for paper clampingyokes 20. The yokes 20are piv- 'otally secured to the drawing board 16 by means of headedstuds 21 which are riveted to'the yokes, as shown inFig. 6, and extendthrough L-shaped slots 22in metal plates 23 secured to the two sides ofthe board 16.

Theheads 24 of studs 21 extend into recesses 25 in the sides of thedrawing board 16 nd areengagedby theends 26 of springs 27.

These springs are secured to the board 16 by means of the screws 28,and-the function of the springs is to urge the clamping'yokes 20 totheirightyFig. 7 along the L-shaped slots 7 22, so that the parts '29 ofthe yokes will firmly clamp the edges of the drawing material 30 of anydesired ---thickness against the. ends o'fjthe board16. Clamping yokes20 may be provided with operating handles 31 as showninFig. 3. The board16 is preferably. beveled at the edges 32 thereof, 10- cated adjacent tothe parts 29 of-yokes 20, i 1 order that when paper is placed'on theboard 16 and the yoke members rock downwardly .7 'into clampingposition, the paper, will be stretched tight over the board; 1

For the purpose of providing a suitable support along which a rulingblade 33 is adjustable, the frame or table member 3has secured {theretoat' its left edge an angle bar.

34, as; shown-in-Figsg5 and 11. The angle bar 134 at its ends'isprovided with bracket members 35 within which is mounted rod 36 ofcircular crosssection, and slida'b-le on rod 36 is a supporting plate 37for the rulingblade 33. :The plate 37 has downwardly extending'apertured ears 39 forming bear ings on the rod 36' ,Theiruling blade 33is secured to plate37 by means of the screws 40 as shown in Fig. 9,and'to one side of the 7 44 extending ,upw-ardly sand downivardlyspindle 45 'rotatably 'mounted thereon. Screwed to the lower endof-spindle 45'is a pinion 46, in position to mesh with a rack 67 fasttotheangle bar 34. With this con struction, rotation of spindle 45 willcause the pinion 46 to roll along the fixed rack 67 and thereby shiftthe bearing member 41 and parts mounted thereon. The spindle 45 may' bethus rotated by means of a toothed disk 5 47, which is preferably pinnedto spindle 45 by the pin 48, as shown in Fig. 11. p For the purpose ofdifferentially rotating" the toothed disk 47 definite predeterminedextents, a lever 49 is journaledon the sleeve 43 and carries aspring-pressed double'p'awl 50 for engagement with the toothed disk47,This pawl may be rocked from oneside to the other of-itscentralposition'as shown'in Fig. 9, so that it will engage and drive disk 47 onthe up or down strokes of theoperating handle 49. The motion of lever49may be limited in either direction by'means of adjustable stops 51and-52 in the'form of upstanding lugs on disks 53 and 5'4,"which'are'rotatably mounted on sleeve 43. The" stops 51 and 52 cooperate witha'lug 55 'inte gral' with'the operating handle49. The dlsks 53 and54'may be locked inany desired angular position by means of a clamp arm56 which has threaded engagement with a" 7 Screw pped into and"extending, upj wardly'from a'disk 58 secured tothe bearing" member 41.Thus by'rockin-g clamping armi 56 to the right, Fig. 9'; each of disks53 "and 54 is released and may then be rotated to shift the stops 51 and52 to the desired posi tionwith respect to lug 55 on theop'eratinglever. The disks 53 and '54 have circular slots 59 at the location of"screw 58; -When; the stops 51 and 52 are adjusted as desired, the sameare locked into-position by rocking;

' theclamping arm to*the 1eft,'thereby cansing it to clampithe disks 53and 54 against the fixed plate or disk 58. The bearing plate 41 isrotatable aroundits pivot 42, *for the purpose of engaging anddisengaging the? p1n1on 46 from the rack 67. The plate 41" 7 may belocked in either of its'set positions by means'of a locking clamp 60,which has threaded engagement with? ascrew l 61- xgk 1 5 e P e y r i'the pla e37. 1 Thepawl 50 isjpreferably a e than-the toothed wheel..47, in order'fitha i1 it this pawl may engageidifferent"removable if '7toothed wheels 62 which may be placed over the hub of the wheel 47 andlsecuredthere to by 'a dowel-pin 63extending upwardlyzr' from wheel 47into apertures in the toothed" members 62. The 'members 62* mayibe r 7 9with notches .64 inthe' periphery 'ofeach:

formed, for example as -shown '-in Fig.-

spaced different distances apart. Thei fari 'rangement. shown issuitable -forshading: curved surfaces, such as a shaft. Thusg thetherefrom and .providingithe bearing for the -first FOperation of lever49 mayfshift 1 .30

ruling blade only a very slight extent, whereas on succeeding operationsof the lever, the ruling blade is shifted successively increasingextents.

For the purpose of supporting a scale 68 along the path of travel of theruling blade 33, an angle bar 69 is securedto the bracket members 35 andsupports a guideway 70 for the ruling blade. A bar 71 rigid with theangle bar 69 extends along the inner edge 72 of the supporting plate 37and assists the rod 36 in guiding and preventing displacement of plate37 when it is shifted along the rod 36.

The ruling blade is preferably cut away at 75 at its ruling edge in linewith the figures on scale 68, to permit of easily read- 7 ing theposition of the ruling blade. The

blade is also beveled to a comparatively sharp edge 76 adjacent to thegraduations on the scale, for the purpose of minimizing any likelihoodof error in adjusting the same.

In the operation of the device, the ruling blade 33 may be quicklyadjusted to any de sired position along the rod 36 by simply rocking theblade upwardly around said rod, thereby disengaging pinion 46 from rack67 and then shifting the blade along the rod, or the bearing rod 41 maybe adjusted to a position where the pinion is unmeshed from the rack,thus permitting the ruling blade to slide freely along the guide rodWhile remaining in contact with the drawing board. The blade may be veryaccurately adjusted by rotating the toothed disk 47 causing pinion 46 toroll along rack 67 and shift the supporting plate 37 and mechanismmounted thereon. The disk 47 may be rotated directly by the hand orthrough the lever 49. If it is desired to shift the ruling bladedefinite distances such as are required in sectional lining, the stops51 and 52 are adjusted to regulate the throw of the operating lever 49.

Should it be desired to successively shift the ruling blade definitevariable extents, the desired one of notched disks 62 is placed over thehub of the toothed wheel 47. The disks 62 are preferably of somewhatgreater diameter than the wheel 47 and thereby serve to disengage pawl50 from said wheel. Upon the operation of the operating handle 49, thespindle 45 and pinion thereon are rotated different extents according tothe spacing of notches 64 in disk 62.

The circular board 4 may be rotated and clamped in any desired angularposition, and accordingly, the usual triangles and protractors may bedispensed with, all lines of whatever angle being drawn from left toright along the ruling blade 33.

Although but one specific embodiment of this invention has.been hereinshown and described, it will be understood that numerous details of theconstruction shown may be altered or omitted without departing from thespirit of this invention as defined by the following claims.

I claim:

1.,A device of the class described, comprising a supporting frame, adrawing board mounted thereon to rotate in its own plane, a ruling blademounted for adjustment transversely of the axis of said drawing board,means for adjusting said ruling blade, comprising a fixed rack, arotatable pinion carried by said ruling blade in position to engage saidrack, means for rotating said pinion, and means for guiding said rulingblade as driven by said pinion.

2. A device of the class described, comprising a supporting structure, adrawing board mounted thereon to rotate in its own plane, a guide rodsecured to said supporting structure, a ruling blade slidably mounted onsaid guide rod, a pinion journaled on said ruling blade, a rack securedto, said supporting structure in position to be engaged by said pinion,and means for rotating said pinion for the purpose of shifting saidruling blade along said guide rod.

3. A device of the class described, comprising a supporting structure, adrawing board mounted thereon for rotation in its own plane, a guide rodsecured to said supporting frame at right angles to the axis of saiddrawing board, a ruling bladepivotally and slidably mounted on saidguide rod, a pinion carried by said rulin blade, and a rack fixed tosaid supportmg frame in position to be engaged by said pinion.

4. A device of the class described, comprising a supporting frame, adrawing board mounted thereon to rotate in its own plane, a rulingblade, fixed guides for said ruling blade whereby the same may beshifted transversely of the axis of said drawing board, and adjustablemeans mounted on said ruling blade for causing said ruling blade totravel along said guiding means.

5. A device of the class described, comprising a supporting frame, adrawing board mounted thereon to rotate in its own plane, a ruling blademounted on said frame for adjustment transversely to the axis of saiddrawing board, means for adjusting said ruling blade, comprising apinion rotatably mounted on said ruling blade, a rack fixed to saidsupporting frame in position to mesh with said pinion, a toothed wheelrigid with said pinion, and an arm pivoted concentric with said toothedwheel and pro vided with a'pawl for engaging and rotating said wheelupon oscillation of said arm.

I 6. A device of the class described, comprising a supporting frame, adrawing board mounted thereon to rotate in its own plane, a ruling blademounted on said frame for adjustment transversely to the axis of saiddrawing board, means for adjusting said ruling blade, comprising apinion rotatably mounted on said ruling blade, a rack fixed to saidsupporting frame in position to mesh With said pinion, a toothed Wheelrigid With said pinion, an arm pivoted concentric With said toothedWheel and provided Witha pawl for engaging and rotating said Wheel uponoscillation of said arm, and adjustable means on said ruling blade forlimiting the motion of said arm.

7. In a device of the class described, the combination With a drawingboard, of a guide secured thereto, a ruling blade slidably mounted onsaid guide, a rack extending alongthe path of movement of said -rulingblade, a pinion carried by said :ruling blade, and means for movingsaidpinion into and out of mesh With said rack.

8. A device of the-class described, comprising a supporting frame, 'adrawing board mounted thereon to rotateiin its own guidesecured'thereto, a ruling blade slidablymountedon said guide, meansmounted on sa-idblade for shifting the blade along said guide, saidmeansincluding a pivoted operatmg lever, a pa r of ad ustable shoulderedstops pivoted concentric With said operating lever and for limiting themotion of said lever'in either direction, and means for clamping saidstops indifferent angulanpositions With respect-to said operating lever;

SignedatChicago this" 25th day'of July, 1916. l

VICTOR :-Gopies :of this patent may 'beobtained for five nents each,',1y addressing the flommissioner ofiatents,

. washingto'nf-D. 0:

